Vacuum-cleaner.



A. B. MARSHALL.

VACUUM CLEANER.

APPLICATION FILED JUNE 27, 1913.

Patented Aug. 4, 1914.

WITNESSES ATTORNEYS UNITED STATES PATENT OFFICE.

AQUILA BOLTON MARSHALL, OF NEW YORK, N. Y., ASSIGNOR T0 AMERICANRADIATOR 00., 0F BROOKLYN, NEW-YORK.

To all whom it may concern Be it known that I, AQUILA B. MARSHALL,

a citizen of the United States, and a resident of the city of New York,borough of Brooklyn, in the county of Kings and State of New York, haveinvented a new and Improved Vacuum-Cleaner, of which the following is afull, clear, and exact description.

My invention has for its object to provide a vacuum cleaner having asuction cleaning tool with a spring valve for normally closing a valveopening in the tool, but which will open should the mouth of the toolinadvertently become closed or partially'closed when used by aninexperienced operator, to permit the entrance of air to the main beforethe pressure in the main is reduced to a point at which the motor-fordriving the vacuum pump is automatically stopped by atmosphericpressure; .means being pro vided for stopping the motor by atmosphericressure when the pressure in the main fa ls to a predetermined point.

Still another object of the invention is to provide the tool with aplurality of epenings which are normally covered by a valve, but whichmay be opened as desired by the operator, to admit a supply of air atthe rear of the mouth of the tool, thereby regulating the flow of theair into, the mouth of the tool, and permitting the use of the tool fora great variety of urposes, without changing the suction at t e pump.

Still other objects of the invention will appear in the following comlete s ecification, in which the referred orm o the invention isdisclosed In the drawings similar characters of reference indicatecorresponding parts in all the views, in which-- Figure 1, is anelevation showing the invention with parts broken away to illustrate theautomatic means for operating the switch of the electric motor; Fig. 2{is an enlarged view showing the SllClSlOI'L cleaning tool; Fig. 3 isasectional view on the 11116 3+3 of Fig. 2; Fig. 4 is a view showing thevalve seat in the tool; and Fig. 5 is a. view showing the valve in plan.

By: referring to the drawings it W111 be seen that an, electric motor5"is provided, which is connected for driving a rotary pump 6, by meansof the belt 7, which connects the pulley 8 on the shaftof the motorSpecification of Letters Patent.

Application filed, June 27, 1913.

VACUUM-CLEANER.

Patented Aug. 4, 1914.

Serial No. 776,087.

5 with the pulley 9 on the pump 6. A pipe 10 leads from the separator 11to the rotary pump 6, and below the separator 11 there is a dust bucket12, all constructed in a manner which is readily understood.

Leading to the separator 11 there is a suction main 13, and connectedwith the suction main or pipe 13 there is a pipe Li, which leads to acasing 15 having a diaphragm l6, movable by a change of ressure in thesuction main or pipe 13. Tiis diaphragm 16 is connected by a cord 17with a switch arm 18 having a contact member 19, for engaging a contactmember 20. The switch arm 18 is .held with its contact 19 yieldingly inengagement with the contact 20 by its weighted arm 21, so that a circuithaving the wires 22, 23 and 24, and, connected with the motor 5, will beclosed, when there is suflicient pressure in the plpe or suction main 13to hold the diaphragm in the position shownin Fig. 1 of the drawings.However, when the pressure is decreased in the pi diaphragm 16 wi thedrawn away from the contact point 20, "carrying with ,it the cord 17 andthe switcharm 18, to move the contact member 19 out of en agement with.the contact 20. This will break the circuit through which the currentflows to the motor 5, thereby stopping the motor.

In the suction mam or pipe 13 there is an inlet 25, with which may beconnected the pipe or hose 26, with which is connected the pipe portion27 of the suction cleaning tool 28, this suction cleaning tool 28'having a chamber 29 with which communicates the mouth 30 of the suctioncleaning tool. This suction cleaning tool 28 is constructed with athreaded opening 31, in which meshes the valve seat 32, shown in Fig. 4of the drawings, there being a spring valve 33 at the inner side of thevalve seat 32, which is held in place by a screw 34, disposed through ano ening in the spring valve 33, and meshing 1n the threaded orifice 35in the valve seat 32. This valve seat 32 has a central opening 36, and aplurality of valve openings 37, disposed therearound, the valve 38 shownin Fig. 5 of the drawings being provided for closing the valve openings37, as may be desired. This valve 38 is disposed at the outer side ofthe valve seat 32, and is adapted to rotate to close one or more of thevalve openings 37, as may be desired,

e or suction main 13, the

a ring 39 with a thread being provided for meshing in the threadedopening 31, for preventing the movement of the valve 38 out of position.This valve 38 has a central opening 40, which registers with the opening36 in the valve seat 32, so that-the opening 36 is never covered by thevalve 38, although this opening 36 is normally held closed by the springvalve 33. i

The openingAO in the valve 38 is not only sufliciently large to uncoverthe opening 36 at all times, but it also extends beyond the opening 36at 41 so that it may be moved to uncover the valve openings 37 as may,be desired, the valve 38 being adapted to uncover one'or more of theseopenings 37, or, if desired, cover all the valve openings 37 to preventthe air from passing therethrough.

The spring valve 33 is adjusted with 26 reference to the diaphragm 16,and the switch arm having the weighted arm 21, so that the spring valve33 will move under a reduction of pressure in the pipes 26 and 13,before the pressure has been sufficiently reduced to operate thediaphragm 16, and

the switch arm 18 having the weighted arm 21. It will therefore be seenthatas the opening 36 is never covered by the valve 38, there is nodanger of a movement of. the

diaphragm 16 to throw the switch arm 18 and break the circuit, therebystopping the motor, even should the carelessness of the operator bringthe mouth 30 of the suction cleaning tool 28 into contact with a surfacewhich will prevent the passage of air into the suction cleaning tool-28,through its contact 30. However, when the pipe 26 1s removed from theinlet 25, and a cap or valve is placed over the inlet to prevent air 40from passing therein, the reduction of pressure in the pipe 13, causedbythe suction of the rotary pump 6, will draw in the diaphragm, and by themeans described, move the switch arm 18 to move the contact'ltl,

with the switch arm, so that the contact will no longer engage thecontact 20. v This will break the circuit, and stop the motor.

In order to obtain the best results with the suction cleaning tool, itis necessary to regulate the suction at the mouth 30 of the suctioncleaning tool 28, and this I accomplish by uncovering the valve openings37, as may be desired, these valve openings 37 serving as by-passes topermit the air to enter the pipes, and suction main, without all thevalve openings 37 are covered, and I passing through the mouth 30. WhenOne I of these valve openings 37 is uncovered by the valve 38, thesuction at the mouth 30 of the tool is slightly less than is the caseWhen when two of these valve openings 37 are uncovered by the valve 38,a still further reduction in suction at the mouth 30 is obtained. Inthis Way the suction at the mouth of my suction cleaning tool 28 may beadjusted to clean under the most favorable conditions articles ofvarious kinds of material. Ihe valve 38 has thumb pieces 42 by which itmay be readily rotated.

Having thus described my invention, I claim as new and desire to secureby Letters Patent i 1. In a vacuum cleaner, a suction cleaning toolhaving a mouth, a valve seat spaced therefrom and having a central valveopening and a valve opening disposed at one side thereof, a resilientvalve secured to the inner side of the valve seat for closing thecentral valve opening and a valve mounted for rotating on the valve seatand having an opening for the passage of air to the central opening inthe valve seat, the opening in the second mentioned valve having anextension at one side for uncovering the second valve opening with therotation of the second mentioned valve.

2. In a vacuum cleaner, a suction cleaning tool having a mouth and athreaded opening spaced therefrom, a valve seat wlth a thread meshing inthe threaded opening, the valve seat having a central valve opening anda valve opening disposed at one side thereof, a resilient valve securedto the inner side of the valve seat for closing the central valveopening, and a valve mounted for rotating on the valve seat and havingan opening for the passage of air to the central opening in the valveseat, the opening in the second mentioned valve having an extension atone side for uncovering the second mentioned valve opening with therotation of the second mentioned valve.

3. In a vacuum cleaner, a suction cleaning tool having a mouth, a valveseat spaced therefrom and having a central opening and a second opening,aresihentyalve for normally closing the central opening 1n the valveseat, and a valve mounted for'rotat ing on-the valvescat, the secondmentioned valve permitting the passage of ant to the central opening inthe valve seat at all times, and being adapted for closing the secondmentioned opening in the valve seat.

I In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses,

AQUILA BOLTON MARSHALL. Witnesses g WM. Cosenovn,

G. A, FRAMM.

